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[217.70.183.195]) by mx.google.com with ESMTPS id c44si2033896ede.368.2019.04.19.00.21.23 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 19 Apr 2019 00:21:23 -0700 (PDT) Received-SPF: neutral (google.com: 217.70.183.195 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) client-ip=217.70.183.195; Authentication-Results: mx.google.com; spf=neutral (google.com: 217.70.183.195 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr X-Originating-IP: 81.250.144.103 Received: from [10.30.1.20] (lneuilly-657-1-5-103.w81-250.abo.wanadoo.fr [81.250.144.103]) (Authenticated sender: alex@ghiti.fr) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 78D2F6000E; Fri, 19 Apr 2019 07:21:16 +0000 (UTC) From: Alex Ghiti Subject: Re: [PATCH v3 08/11] mips: Properly account for stack randomization and stack guard gap To: Paul Burton Cc: Albert Ou , Kees Cook , Catalin Marinas , Palmer Dabbelt , Will Deacon , Russell King , Ralf Baechle , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , Luis Chamberlain , "linux-riscv@lists.infradead.org" , Alexander Viro , James Hogan , "linux-fsdevel@vger.kernel.org" , Andrew Morton , "linux-mips@vger.kernel.org" , Christoph Hellwig , "linux-arm-kernel@lists.infradead.org" References: <20190417052247.17809-1-alex@ghiti.fr> <20190417052247.17809-9-alex@ghiti.fr> <20190418212701.dpymnwuki3g7rox2@pburton-laptop> Message-ID: Date: Fri, 19 Apr 2019 09:20:01 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 In-Reply-To: <20190418212701.dpymnwuki3g7rox2@pburton-laptop> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: fr Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 4/18/19 5:27 PM, Paul Burton wrote: > Hi Alexandre, > > On Wed, Apr 17, 2019 at 01:22:44AM -0400, Alexandre Ghiti wrote: >> This commit takes care of stack randomization and stack guard gap when >> computing mmap base address and checks if the task asked for randomization. >> This fixes the problem uncovered and not fixed for mips here: >> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1429066.html >> >> Signed-off-by: Alexandre Ghiti > For patches 8-10: > > Acked-by: Paul Burton > > Thanks for improving this, Thank you for your time, Alex > Paul > >> --- >> arch/mips/mm/mmap.c | 14 ++++++++++++-- >> 1 file changed, 12 insertions(+), 2 deletions(-) >> >> diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c >> index 2f616ebeb7e0..3ff82c6f7e24 100644 >> --- a/arch/mips/mm/mmap.c >> +++ b/arch/mips/mm/mmap.c >> @@ -21,8 +21,9 @@ unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ >> EXPORT_SYMBOL(shm_align_mask); >> >> /* gap between mmap and stack */ >> -#define MIN_GAP (128*1024*1024UL) >> -#define MAX_GAP ((TASK_SIZE)/6*5) >> +#define MIN_GAP (128*1024*1024UL) >> +#define MAX_GAP ((TASK_SIZE)/6*5) >> +#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) >> >> static int mmap_is_legacy(struct rlimit *rlim_stack) >> { >> @@ -38,6 +39,15 @@ static int mmap_is_legacy(struct rlimit *rlim_stack) >> static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack) >> { >> unsigned long gap = rlim_stack->rlim_cur; >> + unsigned long pad = stack_guard_gap; >> + >> + /* Account for stack randomization if necessary */ >> + if (current->flags & PF_RANDOMIZE) >> + pad += (STACK_RND_MASK << PAGE_SHIFT); >> + >> + /* Values close to RLIM_INFINITY can overflow. */ >> + if (gap + pad > gap) >> + gap += pad; >> >> if (gap < MIN_GAP) >> gap = MIN_GAP; >> -- >> 2.20.1 >> > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv